Experimental Study on Graphite Purification by Force-Thermal Field Coupling Fluorine Free Alkali Acid Method
In order to improve the grade of high-purity graphite prepared by alkaline acid method and reduce environmental pollution,this study used Luobei graphite flotation concentrate as raw material to study the purification effect of force-thermal field coupling fluorine-free alkaline acid on graphite.The results showed that under the conditions of NaOH dosage of 250 kg/t,alkali melting temperature of 750℃,alkali melting time of 60 min,HCl dosage of 300 kg/t,acid leaching temperature of 85℃,and acid leaching time of 4 h,two ultrasonic stages were carried out:the first stage was 360 W ultrasonic intensity,washed at 80℃for 30 min(after alkali melting),and the second stage was 180 W ultrasonic intensity,washed at 70℃for 20 min(after acid leaching),the final high-purity graphite was obtained with a fixed carbon content of 99.973%,Si content of 101 μg/g,Al content of 31 μg/g,and Fe content of 29 μg/g.
high purity graphitealkali acid methodgraphite purificationmulti field coupling